Pulse Room in Aarhus, Denmark,2009
About 100 (analog/classic) light bulbs are hung from ceiling of the installation site.
The bulbs plays a sequence of blinking. Every singe bulb represents and actually repeats heartbeat of past participants as 1 by 1 correspondence.
Sequence of how new participant joins is as following.
One of audience grabs a handle which heartbeat sensor is embedded.
It takes a short while until the sensor stabilize its readout. When it is done, whole order of pulses of bulbs shifts 1 (the oldest is now gone). And the new beat joins.
(Aug 2011)